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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 03-14-2005, 11:25 PM   #1 (permalink)
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i had a high flow catalytic converter on my 325is today and it makes a pinging sound from about 2000rpm up to about 3500 when the vanos kicks inn.

why does it do this? is it because i took off the resonators and will it go away if i use glasspacks as mufflers because they act as resonators?
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Old 03-15-2005, 02:19 PM   #2 (permalink)
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i didn't install it myself, i had my mechanic install it and it took about an hour and a half
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Old 03-15-2005, 02:41 PM   #3 (permalink)
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More exhaust flow = Leaner mix.

If you are too lean now you could be pinging in the motor which is detonation and a VERY big deal. You need to check the a/f and make sure this isn't the case. If it is and you don't take care of it right now you coudl grenade the motor.
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Old 03-15-2005, 03:45 PM   #4 (permalink)
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Originally posted by bluee36e36@Mar 15 2005, 01:25 AM
i had a high flow catalytic converter on my 325is today and it makes a pinging sound from about 2000rpm up to about 3500 when the vanos kicks inn.

why does it do this? is it because i took off the resonators and will it go away if i use glasspacks as mufflers because they act as resonators?
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What year is your 325? My 95 has two cats. Did you replace two with one? Did you replace the whole center section? Pinging is usually a sign of leaness and detonation, not a good thing.
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Old 03-15-2005, 04:15 PM   #5 (permalink)
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i doubt just installing a high flow cat would make his car run lean or else this problem would occur 10,000 times a day on here, there has to be another explaination
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